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Objective:To compare and analyze the image quality, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of T 1WI_Star_VIBE_FS sequence in MRI simulation of neck tumors with different scanning methods, aiming to determine the optimal scanning method. Methods:A retrospective analysis of 78 patients receiving MRI contrast scan was performed. All patients were randomly divided into three groups according to three different scanning methods including bolus mode (group A, n=23), segmentation splicing mode (group B, n=18) and the combination mode (group C, n=37). The image quality, SNR and CNR of the anterior soft tissues of neck were statistically compared. Results:A higher image quality score was obtained in group C. The mean SNR and CNR in three groups were calculated as 214.70±148.78, 91.95±59.26, 307.61±127.80, and 208.74±148.27, 85.79±59.50, 301.58±127.48, respectively. The image quality score, SNR and CNR in group C were significantly better compared with those in group A and B (all P<0.01). Conclusion:Combination of bolus and segmentation splicing modes is a recommended approach in MRI simulation during radiotherapy of neck tumors.
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Objective To investigate the efficacy of concurrent chemoradiotherapy for anal squamous cell carcinoma (ASCC) in the era of intensity-modulated radiotherapy.Methods A total of 19 patients with ASCC who underwent definitive radiotherapy in our hospital since 2011 were collected.The survival curves were depicted with K-M method.Risk factors of disease progression were analyzed using case-control study.Results The median follow-up time was 31 months.The 3 year-LFS and 3 year-OS were 88.1％ and 91.7％,respectively.Grade 3 acute toxicities during the chemoradiotherapy were mainly white blood cell reduction (15.8％),platelet reduction (10.5％),diarrhea (15.8％),and skin reaction (31.6％).Compared with historical data,volumetric intensity modulated arc therapy was superior to conventional radiotherapy in the treatment outcome and normal tissue protection in ASCC.Univariate analysis showed that concurrent chemotherapy with capecitabine was a favorable factor in disease progression (P＜ 0.05).Conclusions Volumetric intensity modulated arc therapy for ASCC may have advantages in terms of efficacy and normal tissue protection.Concurrent chemotherapy with a double-drug regimen containing capecitabine may be a beneficial factor in disease progression.
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Objective To explore the value of MRI simulation in the pre-operative radiotherapy for locally advanced low rectal carcinoma.Methods A total of 40 patients diagnosed with locally advanced low rectal carcinoma by endoscopic biopsy and radiological staging examinations were included in this study.There were 22 male and 18 female with nedian age 58 years (range 31-80).Patients underwent CT and MRI simulation scanning in the same position and fixing device.GTV under CT images and MRI inages were delineated respectively by two experienced radiologists.Primary tumor length,tumor volume and distance of distal tumor from the anal verge were calculated by treatment planning system(TPS).The two groups of data were compared.Results The distance of distal tumor to the anal verge were all no more than 5 cm on digital examination.The mean length of GTVcT was remarkably longer than that of GTVMRI [(5.21 ±1.65) cm vs.(4.46 ± 1.51) cm,t =5.059,P ＜0.05].The mean volume of GTVcTWaS significantly larger than that of GTVMRI[(55.71 ±31.57) cm3vs.(44.02 ±25.11) cm3,t=6.977,P＜ 0.05)].The mean distance of distal tumor to the anal verge was (3.72 ± 0.93) cm,significantly longer than that of lower bounds of GTVCT to the anal verge,which had a high consistency with GTVMRI.The IMRT plan was based on CT-MRI fusion images.There were no 3-4 grade adverse effects of radiotherapy.The overall pCR rate was 32.5％.Conclusions MRI simulation could define smaller GTV and more precise lower bounds than CT.With improved accuracy of target volumes contours,the application of MRI simulation may promote the efficacy of radiotherapy and result in a reduction in the incidence of toxicities.
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Objective To elaborate the glucose and lipid metabolism 1 year postpartum on the foundation of postpartum 6-12 weeks in patients with prior gestational abnormal glucose metabolism in Beijing area.Methods Seventy-three patients who delivered during February to December,2007,aged (32.0 ± 3.6) years,were enrolled.46 cases (63％) were diagnosed as cases of gestational diabetes mellitus (GDM) while 27 (37％) as gestational impaired glucose tolerance (GIGT).All of the patients were revisited twice by 6-12 weeks and 1 year postparaum.Body weight,waist andhip circumferences,oral glucose tolerance test(OGTT),and lipids profile were determined.Results Compared with 6-12 weeks postpartum,the body weight,waist and hip circumferences,and waist-to-hip ratio were decreased by 1 year postpartum,fasting plasma glucose was increased [(5.19 ± 0.06) vs (4.84 ± 0.57) mmol/L,P＜0.01],and 4 cases were diagnosed as cases with impaired fasting glucose (IFG; 4 vs 0).By 6-12 weeks and 1 year postpartum,postprandial plasma glucose levels were (6.84± 1.93) and (7.33 ± 1.50) mmol/L(P=0.017),and the incidences of impaired glucose tolerance(IGT) were 28.8％ and 38.4％ (P=0.167),respectively,with 6 cases of newly diagnosed IGT by 1 year postpartum.There were more cases of hypertriglyceridenia (19.2％ vs 13.7％),less cases of hypercholesterolemia(19.7％ vs 30.0％,P＜0.01),more cases with improved high-densit.y lipoprotein-cholesterol (21.9％ vs 4.1％,P＜0.01),and less cases with raised low-density lipoproteincholesterol(21.9％ vs 49.3％,P＜0.01).No difference was found in body weight,body mass index,waist circumference,hip circumference,and waist-to-hip ratio between GIGT and GDM groups.Conclusion GDM is an important cause of the increasing prevalence of diabetes in women of reproductive age.Although body weight and waist-to-hip ratio have been improved,they would still develop glucose intolerance and dyslipidemia 1 year postpartum.